WO2010126642A1 - Low temperature, moisture curable coating compositions and related methods - Google Patents
Low temperature, moisture curable coating compositions and related methods Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5046—Amines heterocyclic
- C08G59/5053—Amines heterocyclic containing only nitrogen as a heteroatom
- C08G59/506—Amines heterocyclic containing only nitrogen as a heteroatom having one nitrogen atom in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/56—Amines together with other curing agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/14—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3432—Six-membered rings
- C08K5/3435—Piperidines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/544—Silicon-containing compounds containing nitrogen
Abstract
Disclosed are low temperature, moisture curable coating compositions, related coated substrates, and methods for coating a substrate. The coating compositions include an ungelled, secondary amine-containing Michael addition reaction product of reactants including a compound comprising more than one site of ethylenic unsaturation, and an aminofunctional silane.
Description
LOW TEMPERATURE, MOISTURE CURABLE COATING COMPOSITIONS AND RELATED METHODS.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0001] This invention was made with Government support under Contract No.
FA8650-05-C-5010 awarded by the United States Air Force Research Laboratory. The United States Government may have certain rights in this invention.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0002] This application is a continuation-in-part of United States Patent Application
Serial Nos. 11/839,155 and 1 1/839,165, both filed August 15, 2007, both of which claim the benefit of United States Provisional Patent Application Serial No. 60/826*431, filed September 21, 2006, each of which being incorporated herein by reference. This application is a coiitinuation-in-part of United States Patent Application Serial Nos. 12/329,114 and 12/329,087, both filed December 5, 2008, both of which also being incorporated herein by reference.
FIELD OF THE INVENTION
[0003] The present invention relates to coating compositions, such as low temperature, moisture curable coating compositions, related coated substrates, and methods for depositing a coating on a substrate,
BACKGROUND INFORMATION
[0004] Low temperature, moisture-curable coating compositions are desirable in many applications. For example, such coating compositions are, in at least some cases, preferable over, for example, thermally-cured or radiation cured coating compositions because (i) little or no energy is required to cure the composition, (Ii) the materials from which some substrates are constructed cannot withstand elevated temperature cure conditions, and/or (iii) large or complex articles to be coated may not be convenient for processing through thermal or radiation cure equipment.
[0005] Some coating compositions are based on the hydrolysis and condensation of silane based materials that form a crosslinked Si-O-Si matrix. These compositions often form hard, highly crosslinkcd films, which are limited in flexibility. Therefore, the resultant coatings are often susceptible to chipping or thermal cracking due to embrittlement of the
coating film. Moreover, such films can be especially unsuitable for use in coating substrates that can bend or flex, such as elastonicric automotive parts and accessories, for example, elastαmeric bumpers and body side moldings, as well as consumer electronics equipment, among other things. The coating compositions applied to such eiastomeric substrates typically must be very flexible so the coating can bend or ilex with the substrate without cracking.
[0006] As a result, it would be desirable to provide low temperature, moisture curable coating compositions that are capable of producing a flexible, crack resistant coating when applied to a substrate and cured. Moreover, it would be desirable to provide such coating compositions that are, in at (east some cases, substantially solvent free, sprayable at room temperature, and storage stable. In addition, it would be desirable to provide means for improving the hardness of coatings deposited from such compositions without significantly detrimentally impacting the flexibility of such coatings and while still being capable of producing aesthetically pleasing high gloss coatings.
SUMMARY OF THE INVENTION
[0007] In certain respects, the present invention is directed to coating compositions comprising: (a) a hydrolyssable functional group containing compound; and (b) a cyclic diamine according to the general structure:
[0008] In other respects, the present invention is directed Io low temperature, moisture curable coating compositions comprising: (a) au imgelϊed, secondary amine- cαntaining, Michael addition reaction product of reactants comprising, or, in some cases, consisting essentially of: (i) a compound comprising more than one site of ethylenic unsaturation, and (ii) an arninofunctional siHuie; (b) a cyclic diamine according to the general structure:
wherein R1 and each R2, which may be the same or different, represents H or a Cj to CO alkyl group; and (c) a compound comprising functional groups reactive with secondary amine groups.
[0009] The present invention is also related to, inter alia, substrates at least partially coated with such compositions and methods for coating substrates with such compositions.
DETAILED DESCRIPTION OF THE INVENTION
[0010] For purposes of the following detailed description, it is to be understood that the invention may assume various alternative variations and step sequences, except where expressly specified to the contrary. Moreover, other than in any operating examples, or where otherwise indicated, ail numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set- forth in the following specification and attached claims are approximations that may vary depending upon the desired properties to be obtained by the present, invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
[0011] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard variation found in their respective testing measurements.
[0012] Also, it should be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all sub-ranges between (and including) the recited minimum value of 1
and the recited maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value of equal to or less than 10.
[0013] In this application, the use of the singular includes the plural and plural encompasses singular, unless specifically stated otherwise. In addition, in this application, the use of "or" means "and/or" unless specifically stated otherwise, even though "and/or" may he explicitly used in certain instances.
[0014] As previously mentioned, certain embodiments of the preseni invention are directed to coating compositions, such as low temperature, moisture curable coating compositions . As used herein, the term "low temperature, moisture curable" refers to coating compositions that, following application to a substrate, are capable of curing in the presence of ambient air, the air having a relative humidity of 10 to 100 percent, such as 25 to 80 percent, and a temperature in the range of -10 to 12OºC, such as 5 to 80"C, in some cases 10 to 60ºC and, in yet other cases, 15 to 4OºC. As used herein, the term "cure" refers to a coating wherein any crosslinkable components of the composition are at least partially crosslinked. In certain embodiments, the crosslink density of the crosslinkable components, i.e., the degree of crosslinking, ranges from 5% to 100%, such as 35% to 85%, or, in some cases, 50% (o 85% of complete crosslinking. One skilled in the art will understand that the presence and degree of crosslinking, i.e., the crosslink density, can be determined by a variety of methods, such as dynamic mechanical thermal analysis (DMTA) using a Polymer Laboratories MfC 111 DMTA analyzer conducted under nitrogen.
[0015] As will also be appreciated by those skilled in the art, the degree of cure can be determined by testing the solvent resistance of a coating to double rubs of methyl ethyl ketone. The higher the number of double rubs with no damage to the coating, the greater the degree of cure, In this lest, an index finger holding a double thickness of cheesecloth saturated with methyl ethyl ketone is held at a 45° angle to the coating surface, The rub is made with moderate pressure at a rate of 1 double rub per second. As used herein, when it is stated that a coating is "completely cured" it means that the coating is resistant to 100, in some cases 200, double rubs of methyl ethyl ketone according to the foregoing procedure, with no damage to the coating,
[0016] As previously indicated, the coating compositions of the present invention comprise a hydrolyzable functional group containing compounds, such as a silane functional group containing compound. Examples of such compounds include, without limitation: (a)
hydroxy- and/oi silanol-fiuielioruU silicones, such as those described in United States Patent Application Publication No, 2007/0213492 at [0016 ] to [0017] incorporated herein by reference; (b) amino-functionai silicon compounds, such as those described in United States Patent Application Publication No. 2007/0092738 at [0055] to [0063] incorporated heicin by reference; (c) silane functional acrylic monomers and polymers, such as those described in U.S. Pat. No. 6,451,930 at col. 5, line 54 to col. 7, line 24, incorporated herein by reference; and (d) alkoxysilane functional polysiloxanes of the type described in U .S . Pat. No. 6,225,434 at col. 2, line 6 to col. 6, line 63, the cited portion of which being incorporated herein by reference, among many others
[0017] In ceHain embodiments, the hydrolyzable functional group containing compound comprises an ungelled, secondary amine -containing, Michael addition reaction product of reactants comprising a compound comprising more than one site of ethylenic unsatuiation, i.e., a polyethylenically unsaturated compound, such as a poly (meth)acrylate, and an aminofunctional silane. As used heicin, the term " (meth)acrylate" is intended to include both methacrylates and acrylates. As used herein, the term "secondary amine- containing" refers to compounds comprising a secondary amine, which is a functional group wherein two organic substituents are bound to a nitrogen together with one hydrogen. As used herein, the term "ungelleiP refers to iesins that are substantially free of crosslinkmg and have an intrinsic viscosity when dissolved in a suitable solvent, as determined, for example, in accordance with ASTM-D 1795 or ASTM-D4241. The intrinsic viscosity of the resin is an indication of its molecular weight. A gelled resin, on the other hand, since it is of essentially infinitely high molecular weight, will have an intrinsic viscosity too high to measure. As used herein, a resin (or polymer) that is "substantially free of crosslinking" refers to a ieaction product that has a weight average molecular weight (Mw), as determined by gel permeation chromatography, of less than 1,000,000.
[0018] In certain embodiments, the compound comprising more than otic site of ethylenic unsaturation comprises a polyethylenically unsaturated monomer, such as di- and higher acrylates, Specific examples of suitable polyeihyiemcally unsaturated inonomcis are diacrylates, such as 1,6 -hexartediol dincrylate, 1,4-bufaπediol diacrylatc, ethylene glycol diacrylate, diethyleno glycol diacrylatc, tetraethylene glycol diacrylate, tripropylenc glycol diacrylate, ncopcniyl glycol diacrylate, 1,4-butanediol dimethacrylate, poly(butanediol) diacrylate, teti aethylene glycol dimethacrylate, 1 ,3-butylene glycol diacrylate, Methylene
glycol diacrylate, trisopropylene glycol diacrylate , polyethylene glycol diacrylate, and/or bisphenol A dimethacrylate; triacr ylates, such as trimethylolpropane triacrylate, trimethylolpropane trirnethacrylate, penlaerythritot monohydrøxy Uϊacrylatc, and/or trimethylolpropane triethoxy triacrylate; tctraacrylates, such as pcπlacrythritol tetraacrylate, and/or di-trimethylolpropane tetraacrylale; and/or pentaacrylates, such as dipontaerythritol (monohydroxy) pentaacrylate.
[0019] In addition to or in lieu of the aforementioned polyethylcnically unsaturated monomers, the compositions of the present invention may comprise the Michael addition reaction product of reactants comprising a polyethyletiically unsaturated oligomer, As will be appreciated, the term "oligomer" and "polymer" are frequently used interchangeably. Although the term "oligomer" is generally used to describe a relatively short polymer, the term has no generally accepied definition with respect to the number of repeating monomer units, As used herein, therefore, in describing compounds comprising more than one site of cthylenic unsaturation, the terms "oligomer" and "polymer" are meant to be interchangeable.
[0020] Examples of some specific polycthylenically unsaturated oligomers suitable for use in the present invention Include, for example, urethane acrylates, polyester acryiates and mixtures thereof, particularly those that arc free of hydroxy! functional groups, Specific- examples of such materials include urethane acrylates, such as Ebecryl 220 and Ebecryl 264 available from Cytec Surface Specialties Inc. and polyester acryiates, such as Ebecryl 80 available from UCB Chemicals.
[0021] As previously indicated, in certain embodiments of the coating compositions of the present invention, the comρound(s) comprising more than one site of etliylenic unsaturation identified above is reacted with an amino functional silane. As used herein, the term "aminofunciional silane" refers to a compound having a molecular structure that includes an amine group and a silicon atom.
[0022] In certain embodiments, the amino functional silane utilized, in the coating compositions of the present invention comprises a compound having the formula:
[0023] Specific examples of amino functional si lanes which are suitable for use in the present invention include aminoeihyltriethoxysilane, γ-arninopropyltriethoxysilane, γ- aminopropylmethyldiethoxysilane, γ-aniinoρropylethyldiethoxysilane, γ- aminopropylphenyldiethoxysilane, γ-aftunopropyltrimethoxysilane, δ- aniinobutyltriethoxysilane, δ-aininobutylelhyldiethoxysilatie. ϊ ft certain embodiments, the anώiofunctional silane comprises a γ-aminopropyltrmlkoxysilane.
[0024] In certain embodiments of the present invention, little or no other reactant, such as a polyamine, is added to the reactant mixture for the Michael addition reaction. As a result, in certain embodiments, the reactants taking part in the Michael addition reaction are substantially free, or, in some eases, completely free of any polyamine. As used herein, the term "polyamine" refers to compounds comprising two or more primary or secondary amino groups, As used herein, the term "substantially free" means that the material being discussed is present in a composition, if at all, as an incidental impurity, In other words, the material does not affect the properties of the composition. As used herein, the term "completely free" means that the material being discussed is not. present in a composition at all. The inventors have discovered that the presence of any significant quantity of polyamine can, in at least some cases, result in increased yellowing, the generation of additional unwanted byproducis} and/or an undesirable accelerated building of viscosity in the Michael addition reaction product.
[0025 ] In certain embodiments, the ungolled Michael addition reaction product is formed by simply blending the reactants al room temperature or at a slightly elevated temperature, for example, up to K)OºC. The reaction of an amine group with an elhylenically unsaturated group which occurs in this invention is often referred to as a Michael addilion reaction. As a result, as used herein, the term "Michael addition reaction product" is meant to refer to the product of such a reaction. Such products can be more heat and light stable than
greater aeryiyl content-containing products, It should be recognized that slowly adding Che aminofunctional silane to the compound comprising more than one site of elhylenic unsuturation results in there being a large excess of acrylate groups to aminofunctional silane. Unless the temperature of the reaction mixture is kepi sufficiently low, a gelled product can be the result. It is sometimes better, therefore, to add the unsaturated material to a reaction vessel already containing an aminofunctional silane to obtain an ungellcd reaction product. The reaction can be carried out in the absence of a solvent or in the presence of an inert solvent. Examples of suitable inert solvents are toluene, butyl acetate, methyl isobutyl ketone, and ethylene glycol monoethyl ether acetate, It is often desirable thai the reaction be conducted in the absence of moisture or in a controlled amount of moisture Io avoid unwanted side re-actions and possibly gelation.
[0026] In certain embodiments, Michael addition reaction is conducted such that the equivalent ratio of the elhyienically unsaturated groups to the amine groups is at least 1:1, in some cases, at least 1.05:1.
[0027] In certain embodiments, the Michael addition reaction product identified above is present in the coating compositions of (he present invention in an amount of at least 30 percent by weight, such as at least 40 percent by weight, based on the tola! weight of the composition. In certain embodiments, the Michael addition reaction product identified above is present in the coating compositions of the present invention in an amount of no more than 80 percent by weight, such as no more than 60 percent, by weight, with the weight percents being based on the total weight of the composition,
[0028] In certain embodiments, Io produce the coating compositions of the present invention, the previously described Michael addition reaction product is combined with a Michael addition reaction product of reaclants comprising, or, in some cases, consisting essentially of: (a) a compound comprising one site of ethyienic unsaturation, and (b) an aminofunctional silane.
[0029] In certain embodiments, the compound comprising one site of ethyienic unsaturation comprises a (meth)acxylate, including, for example, any C1-C30 aliphatic alkyl ester of (lneth) acrylic acid, non-limiting examples of which include rnethyl(meth)acrylat.e, ethyl(mcth)acrylafe, ρropyl(mcth)acrylaι.e, N-butyl(ineth)acryiate, t-butyl(meth)acrylate, 2- eihylhexyl(meth)aerylaie, isobomyl (meih)acrylate, glycidyl (meth)acrylate, dimethylamino ethyl (meth) acrylate, N-butoxy methyl (meth)acrylamidc, lanryl (meth)acrylate, cyclohexyl (meth)acrylate, and 3,3,5-trirnethylc3'ciohexyl (melh)acrylate.
[0030] As previously indicated, in accordance with certain embodiments of the present invention, the cornpound(s) comprising one site of ethyienie uπsaturation identified above is reacted with an aminofunctional silane. Suitable arninofunctiorial silaiies for this purpose include any of the amino functional silanes previously identified herein.
[0031] In certain embodiments of the present invention, little or no other reactant, such as a polyamine, is added to the reactant mixture for the Michael addition reaction. As a result, in certain embodiments, the reaclants taking part in the Michael addition reaction are substantially free, or, in some cases, completely free of any polyamine,
[0032] In certain embodiments, the Michael addition reaction is performed by simply blending the reaclants at room temperature or at a slightly elevated temperature, for example, up to 100ºC. The reaction can be carried out in the absence of a solvent or in the presence of mi inert solvent. Examples of suitable inert solvents include any of the solvents previously identified herein.
[0033] In certain embodiments, Michael addition reaction is conducted such that the equivalent ratio of the ethylenically unsaturated groups to the amine groups is at least 1 :1, in some cases, at least 1.05: 1.
[0034] In certain embodiments, the Michael addition reaction product of the reaction between an aminofunctional silane and a compound comprising one site of ethyienie urssat.urat.ioji identified above is present in the coating compositions of the present invention in an amount of up to 30 percent by weight, such as tip to 25 percent by weight, based on the total weight: of the composition. In certain embodiments, the Michael addition reaction product of the reaction between an aminofunctional silane and a compound comprising one site of ethyienie unsaturatiou identified above is present in the coating compositions of the present invention in an amount of at least 10 percent by weight, such as at least 15 percent by weight, based on the total weight of the composition.
[0035] As indicated previously, the coating compositions of the present invention comprise a cyclic diamine according to the general structure (I):
[0037] In certain embodiments, the cyclic diamine according to the foregoing general structure is present in the coating compositions of the present invention in an amount of up to 20 percent by weight, such as up to 10 percent by weight, based on the total weight of the composition. In certain embodiments, the cyclic diamine according to the foregoing general structure- is present in the coating compositions of the present invention in an amount of at least 0.1 percent by weight, such as at least 1 percent by weight, based on the total weight of the composition.
[0038] In certain embodiments, at least 50 percent, such as at least 60 percent, of the total secondary amine groups present in the coating compositions of the present invention are present on the αngcllcd, secondary aminc-containiug, Michael addition reaction product of react ants comprising: (i) a compound comprising more than one site of clhylenio unsaturation, and (ii) an amiuofunciional silane. In certain embodiments, no more than 90 percent, such as no more than 75 percent, of the total secondary amine groups present in the coating compositions of the present invention are present on the foregoing Michael addition reaction product.
[0039] In certain embodiments, up to 40 percent, such as up to 20 percent, of the total secondary amine groups present in the coating compositions of the present invention are
present on the Michael addition reaction product of reactaπts comprising: (a) a compound comprising one site of ethylenic unsaturation, and (b) an amino functional si lane described earlier. In other embodiments, however, such a Michael addition reaction product is not present in the compositions of the present invention at all.
[0040] In certain embodiments, at least 10 percent, such as al least 20 percent, of the total amine groups present in the coating compositions of the present invention are present on the cyclic diamine of the foregoing general structure. In certain embodiments, no more than 50 percent, such as no more than 40 percent, of the total amine groups present in the coating compositions of the present invention are present on the cyclic diamine of the foregoing general structure (I),
[0041] In certain embodiments, particularly where the coating compositions is intended for use as a primer , the coating compositions of the present invention further comprise a pbenalkamine, As will be appreciated, phenalkamines are a class of Mannich bases obtained by reacting a cardinol-containing extract derived from cashew nutshell liquid, an aldehyde compound, such as formaldehyde, and an amine. Commercially available phenalkamines often use ethylenedi amine and diethyltriarnine as the amine. [0042] It is currently believed that the use of such a phenalkamine in combination with the cyclic diamine of the foregoing structure (T) can significantly increase the cure speed of the coating compositions described herein, particularly low VOC containing compositions, without, in some cases at least, significantly detrimentally impacting the flexibility of the resulting coaling.
[0043] In certain embodiments, the phenalkamine is present in the coating compositions of the present invention in an amount of up to 20 percent by weight, such as up to 10 percent by weight, based on the total weight of the composition, In certain embodiments, the phenalkamine is present in the coating compositions of the present invention in an amount of at least 0.1 percent by weight, such, as at least 1 percent by weight, based on the total weight of the composition.
[0044] As previously indicated, Io produce the coating compositions of the present invention, the previously described Michael addition reaction ρroduct(s), cyclic diamine, and/or phenalkamine are combined with a compound comprising functional groups reactive with secondary amine groups, As will be appreciated by those skilled in the art, such functional groups include, but are not limited to, isocyanates, epoxies, and cthylenically unsaturated groups. In certain embodiments, such a compound is selected from a
polyepoxide, a compound having two or more ethylenically unsaturated groups, or a mixture thereof,
[0045] As used herein, the term "polyepoxide" refers to an epoxy resin having at least two 1 ,2-epoxide groups per molecule. In certain embodiments, the cpoxy equivalent weight ranges from 100 to 4000 based OR solids of the polyepoxide, such as between 100 and 1000, The polyepoxides may be, for example, saturated or unsaturated, and may be, for example, aliphatic, alicyelic, aromatic, or heterocyclic. They may contain substituents such as, for example, halogens, hydroxy! groups, and ether groups,
[0046] Suitable classes of polyepoxides include cpoxy ethers obtained by reacting an. epihalohydrin, such as epichforohydrin, with a polyphenol in the presence of an alkali. Suitable polyphenols include, for example, resorcinol, catechol, hydroquinone, bis(4- hydfoxyρhenyl)-2,2-propane (Bisphenol A), bis(4~hydroxyphenyl)-l,l-isobutaιie, bis(4~ Iiydroxyphenyl)- 1 , 1-clhane, bis(2-hyclroxyphenyl)-mcthane, 4,4-dihydroxybenzophenone, and 1,5-dihydiOxynaphihalene, In some cases, the diglycidyl ether of Bisphenol A is especially suitable.
[0047] Other suitable polyepoxides include polyglycidyl ethers of polyhydric alcohols and/or polyhydric silicones, Suitable polyhydric alcohols include, without limitation, ethylene glycol, propylene glycol, butylcne glycol, 1,6-hexyϊene glycol, neopentyl glycol, cUethylene glycol, glycerol, uimcthylol propane, and pentaerythritol These compounds may also be derived from polymeric polyols, such as polypropylene glycol [0048] Examples of other suitable polyepoxides include polyglycidyl esters of poiyearboxylic acids. These compounds may be formed by reacting epichlorohydrin or another epoxy material with an aliphatic or aromatic polycarboxylic acid, such as succinic acid, adipic acid, azelaic acid, sebacic acid, maleic acid, 2,6-naρh.halene dicarboxylic acid, fumade acid, phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, or trimellitic acid, Dimerized unsaturated fatty acids containing about 36 carbon atoms (Dinner Acid) and polymeric polycarboxylic acids, such as carboxyl terminated acrylonitrile-butadiene rubber, may also be used in the formation of these polyglycidyl esters of polycarboxylic acids, [0049] Polyepoxides derived from the epoxidation of an oiefinically unsaturated alicyclie compound are also suitable for use in the coating compositions of the present invention. These polyepoxides are nonphenolic and arc obtained by epoxidation of alicyelic olefins with, for example, oxygen, perbenzoic acid, acid-aldehyde inonoperacctate, or
peracetic acid, Such polyepoxides include the epoxy alicycHc ethers and esters well known in the art.
[0050] Other suitable polyepoxides include epoxy novoiac resins. These resins are obtained by reacting an epilialohydrin with the condensation product of aldehyde and monohydric or polyhydric phenols. A typical example is the reaction product of eplchlorohydrin with a phenol- formaldehyde condensate.
[0051] Suitable polyepoxides also include epoxy-functional organopolysiloxanes, such as the resins described in United States Patent No, 6,344,520 at col. 3, line 46 to col, 6, line 41 , the cited portion of which being incorporated herein by reference, [0052] The coating compositions of the present invention may contain one polyepoxide or a mixture of two or more polyepoxides.
[0053] As indicated, hi certain embodiments, the compound comprising functional groups reactive with secondary amines groups comprises a compound having two or more ethylenically unsaturated groups. Suitable materials include the polyethylenically unsaturated monomers, such as the di- and higher acrylates described earlier, [0054] In certain embodiments, however, sucli a compound comprises an oligomer containing polymerizable ethylenie unsaturalion. examples of such oligomers, which are suitable for use in the present invention, include polyurethane acrylates, polyester acrylates, polyether acrylates, polyacrylatcs derived from polyepoxides, and acrylate functional acrylic polymers, As will be appreciated by those skilled in the art, such oligomers can be prepared from polyurethane polyols, polyester polyols, polyether polyols, polybtitadiene polyols> acrylic polyols, and epoxide resins by reacting all or portions of ihe hydroxy! groups or epoxy groups with acrylic or methacrylic acid. Also, polyols such as pentaerylhritol and trimethylol 10 propane, propylene glycol, and ethylene glycol can be used. Acrylate functional compounds can also be obtained by transestcrifying polyols with lower alcohol esters of (meth)acrylic acid.
[0055] In certain embodiments of the present invention, the compound comprising functional groups reactive with secondary amine groups comprises a tetrafu notional polyester acrylate, such us (bat which is commercially available from Sartomer under the tradcntiroe CN 2262.
[0056] The coating compositions of the present invention may contain one compound having two or more ethylenically unsaturated groups or a mixture of two or more compounds having two or more ethylenically unsaturated groups.
[0057] In certain embodiments of the presenl invention, the Michael addition reaction produce(s), cyclic diamine, and/or phenalkanrine (component I) and the compound comprising functional groups reactive with secondary amine groups in component 1 (component 2) are present in the composition in amounts such that the molar ratio of secondary amine reactive groups in the composition to the reactive groups reactive therewith is 0.7 to 1.3, in some cases, 0,9 to 1.1, and, in yet other cases 1:1. Indeed, the present inventors have surprisingly discovered that in certain embodiments of the present invention wherein the aforementioned molar ratio is within such a range, the coating compositions are resistant to cracking after exposure to various environmental conditions., such as those described in the Examples, when applied so as to result in a dry film thickness of up to 20 mils, such as I to 20 mils, As used herein, the term "resistant to cracking" means that the completely cured coating exhibits no cracks visible to the naked eye at any distance. [0058] In certain embodiments, the coating compositions of the present invention also comprise a polysiloxane. Suitable poiysiloxanes include those of the formula:
[0062] The coating compositions of the present invention may also include a cure promoting catalyst, such as a base catalyst. Suitable base catalysts include triphenylphosphine, ethyltriphenyl phosphonium iodide, tetrabutyl phosphonium iodide and tertiary amines, such as benzyldimethylamine, dimethylaminocyclohexane, triethylamine, and the like, N-methylirnidaxok% find letrabutyl ammonium hydroxide. When used, such catalysts are, iti certain embodiments, present in an amount of 0.1 to 1 percent by weight, based on the total weight of the coating composition.
[0063] In certain embodiments, the coating compositions of the present invention also comprise a colorant. As used herein, the term "colorant" means any substance that imparts color and/or other opacity and/or other visual effect to the composition. The colorant can be added to the coating in any suitable form, such as discrete- particles, dispersions, solutions and/or flakes, A single colorant or a mixture of two or more colorants can be used in the coating compositions of the present invention,
[0064] Example colorants include pigments, dyes and tints, such as those used in the paint industry and/or listed in the Dry Color Manufacturers Association (DCMA), as well as special effect compositions. A colorant may include, for example, a finely divided solid powder that is insoluble but wettable under the conditions of use. A colorant can be organic or inorganic and can be agglomerated or non-agglomerated. Colorants can be incorporated into the coatings by use of a grind vehicle, such as an acrylic grind vehicle, Lhc use of which will be familiar to one skilled in the ait,
[0065] Example pigments and/or pigment compositions include, but are not limited to, carbazole dioxazine crude pigment, azo, monoazo, clisazo, uaphthol AS, salt type (lakes), bcndmidozolone, condensation, metal complex, isoindolinonc, isoindoline and polyeyclic phfhalocyanine, quinacrklone, perylene, perinonc, diketopyrrolo pyrrole, thioindigo, anthraquinonc, indanthrone, anthrapyrimidine, flavanthrone, pyranthrone, anthanthrone, dioxazine, triarylcarbonium, quiuophthalonc pigments, diketo pyrrolo pyrrole red ("DPPB{}
red"), titanium dioxide, carbon black and mixtures thereof. The terms "pigment" and "colored filler" can be used interchangeably.
[0066] Example dyes include, but are nυt limited io, those chat are solvent and/or aqueous based such as phthalo green or blue, iron oxide, bismuth vanadate, anthraquinonc, pcrylene, aluminum and quinaciϊdone.
[0067] Example tints include, but are not limited to, pigments dispersed in water- based or water miscible carriers such as AQUA- CHEM 896 commercially available from Dcgussa, Inc., CHARISMA COLORANTS and MAXlTONER INDUSTRIAL COLORANTS commercially available from Accurate Dispersions division of Eastman Chemical, Inc.
[0068] As noted above, the colorant can be in the form of a dispersion including, but not limited to, a nanoparticie dispersion. Nanopaiticlc dispersions can include one or more highly dispersed nanoparlicle colorants and/or colorant particles that produce a desired visible color and/or opacity and/or visual effect. NanoparUclε dispersions can include colorants such as pigments or dyes having a particle size of less than 150 nra, such as less than 70 nm, or less than 30 nm. Nanoparticles can be produced by milling stock organic or inorganic pigments with grinding media having a panicle size of less than 0,5 mm. Example nanopaUicie dispersions and methods for making them are identified in United States Patent No. 6,875,800 B2, which is incorporated herein by reference, Nanoparticle dispersions can also be produced by crystallization, precipitation, gas phase condensation, and chemical attrition (i e., partial dissolution). In order to minimize re-agglomeration of nanoparticles within the coaling, a dispersion of resin-coated nanoparticles can be used. As used heiein, a "dispersion of resin-coated nanopartiele.s" refers to a continuous phase in which is dispersed discreet "composite micropardcles" that comprise a nanoparticie and a resin coating on the nanoparticie, Example dispersions of resin-coated nanopartieles and methods for making them are identified in United States Patent Application Publication 2005-0287348 Al , filed June 24, 2004, U.S. Provisional Application No, 60/482,167 filed June 24, 2003, and United States Patent Application Serial No, 1 1/337,062, filed January 20, 2006, which is also incorporated herein by reference.
[0069] Example special effect compositions that may be used in the coating compositions of the present invention include pigments and/or compositions that produce one or more appearance effects such as reflectance, pcarlesccnce, metallic sheen, phosphorescence, fluorescence, photochromism, photosensitivity, thermochromism,
goniochromism and/or color-change. Additional special effect compositions can provide other perceptible properties, such as opacity or texture. In certain embodiments, special effect compositions can produce a color shift, such that, the color of the coating changes when the coating is viewed at different angles, Example color effect compositions are identified in United States Patent No. 6,894,086, which is incorporated herein by reference. Additional color effect compositions can include transparent coated mica and/or synthetic mica, coated silica, coated alumina, a transparent liquid crystal pigment, a liquid crystal coating, and/or any composition wherein interference results from a refractive index differential within the material and not because of the refractive index differential between the surface of the material and the air.
[0070] In certain embodiments, a photosensitive composition and/or photocbrorme composition, which reversibly alters its color when exposed to one or more light sources, can be used in the coating compositions of the present invention. Photochromic and/or photosensitive compositions can be activated by exposure to radiation of a specified wavelength. When the composition becomes excited, the molecular structure is changed and the altered structure exhibits a new color that is different from the original color of the composition. When the exposure to radiation is removed, the photochromic and/or photosensitive composition can return to a state of rest, in which the original color of the composition returns. In certain embodiments, the photochromic and/or photosensitive composition can be colorless in a non-excited state and exhibit a color in an excited state. Full color-change can appear within milliseconds to several minutes, such as from 20 seconds to 60 seconds. Example photochromic and/or photosensitive compositions include photochromic dyes.
[0071] In certain embodiments, the photosensitive composition and/or photochromic composition can be associated with and/or at least partially bound to, such as by covalent bonding, a polymer and/or polymeric materials of a polymciϊzable component. In contrast, to some coatings in which the photosensitive composition may migrate out of the coating and crystallize, into the substrate, the photosensitive composition and/or photochromic composition associated with and/or at least partially bound to a polymer and/or polymcrizable component in accordance with certain embodiments of the present invention, have minimal migration out of the coating. Example photosensitive compositions and/or photochrome compositions and methods for .making them are identified in United States Published Patent Application No. 2006-0014099 Al, which is incorporated herein by reference.
[0072] In general, the colorant can be present in the coating composition in any amount sufficient to iinpait the desired visual and/or color effect. The colorant may comprise from 1 to 65 weight percent of the present compositions, such as from 3 to 40 weight percent or 5 to 35 weight percent, with weight percent based on the total weight of the compositions, [0073] The coating compositions of the present invention can, if desired, be formulated with a variety of organic solvents, such as ketones, including methyl ethyl ketone, hydrocarbons, such as toluene and xylene, and mixtures thereof. [0074] In certain embodiments, however, the coating compositions of the present invention are substantially free, or, in some cases, completely free of any solvent, such as an organic solvent or an aqueous solvent, i.e., water, Stated differently, in certain embodiments, the coaling compositions of ihe present invention are substantially 100 % active. [0075] The coating compositions of the pjcscnt invention can be utilized as one package compositions or as two package compositions. As two packs, one package comprises component 1 described above and the second pack comprises component 2 described above. The previously described additives and other materials can be added to either package as desired or necessary. The two packages are simply mixed together at or near the time of use. [0076] In certain embodiments of the present invention, such as the previously described two package composition, the package comprising the component 1 also includes a moisture scavenger. Suitable moisture scavenging ingredients include calcium compounds, such as CaSCλrVitϊjO, metal alkoxides, such as tetraisopropyltitanate, tetra u butyl titanate- silanes, QP-53 14, vinylsilane (A171), and organic alkoxy compounds, such as trk'thyl orlhoforniate, trimethyl orthofoiirsnte, tetraniclhyl orthosilicate, and melbylorthoformate, [0077] In certain embodiments, the moisture scavenger is present in the package comprising component 1 in an amount of up to 10 percent by weight, such as 0.25 to 9.75 percent by weight, ov, in some cases 5 percent by weight, based on the total weight of component 1.
[0078] The present invention is also directed to multi-pack coating compositions, wherein (A) a first pack comprises (1) an utigcUed, secondary ainine-conlaining, Michael addition reaction product of reactants comprising, or, in some cases, consisting essentially of: (a) a compound comprising more than one site of ethylenic unsatiuation, and (b) an aminαfunetional silatic; (2) a cyclic diamine of the structure (I); and optionally (3) a moisture scavenger; and (B) a second pack comprises a compound comprising functional groups reactive with secondary amine groups.
[0079] The coating compositions of the present invention are suitable for application to any of a variety of substrates, including human and/or animal substrates, such as keratin, far, skin, teeth, nails, and the like, as well as plants, trees, seeds, agricultural lands, such as grazing lands, crop lands and the like; turf-covered land areas, e.g., lawns, golf courses, athletic fields, etc, and other land areas, such as forests and the like, [0080] Suitable substrates include cellulosic-conlaining materials, including paper, paperboard, cardboard, plywood and pressed fiber boards, hardwood, softwood, wood veneer, parficleboard, chipboard, oriented strand board, and fibcrboard. Such materials may be made entirely of wood, such as pine, oak, maple, mahogany, cherry, and the like, In some cases, however, the materials may comprise wood in combination with another material, such as a resinous material, i.e., wood/resin composites, such as phenolic composites, composites of wood fibers and thermoplastic polymers, and wood composites reinforced with cemeni, fibers, or plastic cladding.
[0081] Suitable metallic substrates include, but are not limited to, foils, sheets, or workpieces constructed of cold rolled steel, stainless steel and steel surface- treated with any of zinc metal, zinc compounds and zinc alloys (including electrogalvanized steel, hot-dipped galvanized steel, GALV ANNEAL steel, and steel plated with zinc alloy), copper, magnesium, and alloys thereof, aluminum alloys, ϋinc-aluininum alloys such as GALFAN, GALVAHJMB, aluminum plated steel and aluminum alloy plated steel substrates may also be used, Steel substrates (such as cold rolled steel or any of the steel substrates listed above) coated with a weldablc, zinc-rich or iron phosphide-rich organic coating are also suitable for use in the process of the present invention. Such weldable coating compositions are disclosed in, for example, United States Patent Nos. 4, 157,924 and 4,186,036. Cold rolled steel is also suitable when pretreated with, for example, a solution selected from the group consisting of a metal phosphate solution, an aqueous solution containing at least one Group IIIB or IVB metal, an organophosphatc solution, an organophosphonaLe solution, and combinations thereof. Also, suitable metallic substrates include silver, gold, and alloys thereof,
[0082] Examples of suitable silicatic substrates are glass, porcelain and ceramics.
[0083] Examples of suitable polymeric substrates are polystyrene, polyamides, polyesters, polyethylene, polypropylene, meUuπine resins, polyacrylates, polyaciylonitrile, polyurethanes, polycarbonates, polyvinyl chloride, polyvinyl alcohols, polyvinyl acetates,
polyvinylpyrrolidones and corresponding copolymers and block copolymers, biodegradable polymers and natural polymers - such as gelatin,
[0084] Examples of suitable textile substrates are fibers, yarns, threads, knits, wovens, nonwovens and garments composed of polyester, modified polyester, polyester blend fabrics, nylon, cotton, cotton blend fabrics, jute, flax, hemp and ramie, viscose, wool, silk, polyamide, polyamide blend fabrics, polyacrylo nitrite* triacetate, acetate, polycarbonate, polypropylene, polyvinyl chloride, polyester microfibers and glass fiber fabric.
[0085] Examples of suitable leather substrates are. grain leather (e.g. nappa from sheep, goat or cow and box-leather from calf or cow), suede leather (e.g. velours from sheep, goat or calf and hunting leather), split velours (e.g. from cow or calf skin), buckskin and iiubuk leather; further also woolen skins and furs (e.g. fur-bearing suede leather). The leather may have been tanned by any conventional tanning method, in particular vegetable, mineral, synthetic or combined tanned (e.g. chrome tanned, zirconyl fanned, aluminium tanned or semi-chrome tanned). Tf desired, the leather may also be re-tanned; for re-tanning there may be used any tanning agent conventionally employed for re-tanning, e.g. mineral, vegetable or synthetic tanning agents, e.g., chromium, zirconyl or aluminium derivatives, quebracho, chestnut or mimosa extracts, aromatic syntans, polyurethanes, (co) polymers of (meth) acrylic acid compounds or melamine, dicyanodiamide and/or urea/formaldehyde resins. [0086] Examples of suitable compressible substrates include foam substrates, polymeric bladders filled with liquid, polymeric bladders filled with air and/or gas, and/or polymeric bladders filled with plasma. As used herein the term "foam substrate" means a polymeric or natural material that comprises a open cell foam and/or closed cell foam. As used herein, the term "open cell foam" means that the foam comprises a plurality of interconnected air chambers, As used herein, the term "closed cell foam" means that the foam comprises a series of discrete closed pores. Example foam substrates include polystyrene foams, polymethacrylimidc foams, polyvinylchloride foams, polyurethane foams, polypropylene foams, polyethylene foams, and polyolefmtc foams. Example polyolefinic foams include polypropylene foams, polyethylene foams and/or ethylene vinyl acetate (EVA) foam, EVA foam can include flat sheets or slabs or molded BVA forms, such as shoe midsoles, Different, types of EVA foam can have different types of surface porosity, Molded EVA can comprise a dense surface or "skin", whereas flat sheets or slabs can exhibit a porous surface
[0087] The coating compositions of the present invention can be applied to such substrates by any of a variety of methods including spraying, brushing, dipping, and roll coating, among oihcr methods, Jn certain embodiments, however, the coating compositions of the present invention are applied by spiaying and, accordingly, such compositions often have a viscosity that is suitable for application by spraying at ambient conditions. [0088] After application of the coating composition of the present invention to the substrate, the composition is allowed to coalesce to form a substantially continuous film on the substrate. Typically, the film thickness will be 0.01 to 20 mils (about 0.25 to 508 microns), such as 0,01 to 5 mils {0.25 to 127 microns), or, in some cases, 0.1 to 2 mils (2.54 to 50. B microns) in thickness. The coating compositions of the present invention may be pigmented or clear, ami may be used alone or in combination as pπmcrs, basccoats, or topcoats.
[0089] The coating compositions of the present invention can be cured in a relatively short period of time to provide films that have good early properties which allow for handling of the coated objects without detrimentally affecting the film appearance and which ultimately cure to films which exhibit excellent hatdness, solvent resistance and impact resistance, For example, the coating compositions of the present invention can dry in air at low temperatures to a dust free or tack free state in about 30 minutes, in some case 10 minutes or less. Thereafter, they will continue to cure in air at low temperatures so that a completely cured coaling is formed in from, for example, 12 hours to 24 hours, [0090] Λs a result, as previously indicated, the present invention is also directed to methods for coaling a substrate. These methods comprise: (A) combining the contents of a first package and a second package, wherein (1) the first package comprises: (a) an ungellcd, secondary amine-containing, Michael addition reaction product of reactants comprising, or, in some cases, consisting essentially of: (i) a compound comprising more than one site of etliylenic unsaturation, and (ii) an amino functional silane; and (b) a cyclic diamine of the general structure (I), (2) the second package comprises a compound comprising functional groups reactive with secondary amine groups, and (3) the contents of the first package and the second package arc combined such that molar ratio of secondary amine groups to the functional groups reactive with the secondary amines in the resulting combination is 0.7 to 1.3; (B) applying the combination to at least a portion of the substrate; (C) allowing the combination to coalesce form a substantially continuous film; and (D) allowing the
combination to completely cure within 24 hours in Che presence of air having a relative humidity of 10 to 100 percent and a temperature -10 lo 12OºC. [0091] Illustrating the invention arc the following examples that we not to be considered as limiting the invention Io their details. All parts and percentages in the examples, as well as throughout the specification, are by weight unless otherwise indicated,
EXAMPLE 1
[0092] Λ Michael addition product was prepared as follows from the ingredients listed in Table 1,
Silquest Al l 10 available from Momentive Performance Chemicals.
[0093] Charge #1 was added to an appropriate sized, 4-neclced flask equipped with a motor driven stainless steel stir blade, water-cooled condenser, and a heating mantle with a thermometer connected through a temperature feedback control device, The contents were stirred under a nitrogen blanket. Charge #2 was added at aα appropriate rate to keep the temperature <60°C. Upon completion of Charge #2, the reaction temperature was set to 60ºC. The reaction was held at temperature until the disappearance of the acrylate double bond was demonstrated by IR (peak at -1621cm'1) and/or NMR (peaks at ~ 5.7-6.4 pptn) analysis.
EXAMPLE 2
[0094] Three different samples were prepared by charging a Michael addition product of Example 1 , into a container and mixing in the following ingredients as shown in Table 2 under ambient conditions.
'Triethyl orthoformalc, trimcthyl orthofomiate and tctramethyl orihosilicate are available from Sigma Aldrich Company.
EXAMPLE 3 [0095] A Michael addition product of Example 1 , and Samples "B", "C" and "D", of
Example 2 were monitored for changes in viscosity via the Bubble Tube Viscosity method in accordance with ASTM 01545-89, The samples were analyzed after 6 weeks at room temperature and 120ºF and results are set forth in Table 3.
EXAMPLE 4
[0096] Coating compositions were prepared by combining the ingredients listed in
Table 4 in a suitable container equipped with a paddle blade inker,
[0097] The coating compositions of Bxample 4 were coated onto Bonderite 1000
CRS avid chrome treated aluminum panels at film thicknesses of I , 6 and 14 rails, The coated substrates were allowed to stand under ambient conditions for 24 hours, at which time they were completely cured. The samples were then exposed to various environmental conditions as illustrated in Table 5. The samples were then observed for signs of cracking. Results are set forth in Table 5, In Table 5, the term "No Cracking" means that there was no cracking of the film on the sample and the film was 100% continuous as observed with the naked eye. The term "Moderate Cracking" means that there was some cracking of the film on the sample, but there were other areas of the film on the substrate in which the film was continuous, The term "Severe Cracking" means that there was no section on the panel where cracking did not exist and in some locations the film had lifted off or deiaminated,
EXAMFLE 6
[0098] Various pigment grinds were prepared using the ingredients listed in Table 6
(amounts are in parts by weight). The pigment grinds were prepared by first adding the component 1 to a stainless steel pot of an appropriate size for the total volume of dispersion.
Mild agitation with a Cowles blade and air motor of was commenced and components 2 and 3 were added, After mixing for 10 minutes all pigments were added slowly under strong agitation and the resultant mixture was allowed to mix for thirty minutes. Thereafter, the Cowles blade was removed and replaced with a solid dispersion disk of the same size. The agitation speed of the air motor was turned up to the highest speed attainable and zircoa beads were added to approximately one and a half times the weight of the mix in the pot. The pot was placed in a water bath and covered. Agitation was stopped after several hours once a Hegman grind of 7 was achieved. Any additional resin, additives or solvent identified as let down was then added under reduced agitation. The zircoa beads were then filtered out.
[0099] Coating compositions were prepared by combining Ae ingredients listed in
Table 7 in a suitable container equipped with a paddle blade mixer, In each case, the amounts are in parts by weight and ihe number of equivalents of epoxy groups or secondary amine groups are reported. The "A" side and the "B" side were combined just prior to application. The coating compositions were coated onto cold rolled steel with iron phosphate pretreatment and chrome rinse at a film thickness of about 1.8 to 2,5 mils by spray application with a Devilbiss JGA-510 conventional spray gun at 74°F and 53% relative humidity,
[0100] Coated panels were allowed to cure for two weeks at approximately 40% relative humidity and 80ºF before testing. Results are set forth in Table 8.
26 Cracking, if seen, is repotted as the distance (in millimeters) from the end of the panel lo the last crack observed,
EXAMPLE 8
[0101] Coating compositions were prepared by combining the ingredients listed in
Table 9 (amounts arc in parts by weight).
[0103] It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof, It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications which arc within the spirit and scope of (lie invention, as defined by the appended claims.
Claims
WE CLAIM:
1, A coating composition comprising:
(a) a hydrolyzable functional group containing compound; and
(b) a cyclic diamine according to the general structure:
2. The coating composition of claim 1, wherein the composition is a low temperature, moisture curable coating composition.
3. The coating composition of claim 1, wherein (a) comprises an ungelled, secondary amine-containing, Michael addition reaction product of reactants comprising:
(1) a compound comprising more than one site of ethylenic unsaturalion, and
(2) an aminofunctional silane.
4. The coating composition of claim 3, further comprising
(c) a compound comprising functional groups reactive with secondary amine groups.
5. The coating composition of claim 4, wherein components (a), (b) and (c) are present in the composition in amounts such that the molar ratio of secondary amine groups to functional groups reactive with secondary amine groups is 0.7 io 1 ,3.
6. The coating composition of claim 1 , wherein R' is H or methyl and each R2 is H or methyl.
7. The coating composition of claim 1 , further comprising a phenalkanune.
8, The coating composition of claim 3, wherein the aminαfunclioiial silane comprises a compound having the for inula:
9, The coating composition of claim 8, wherein R' is an alkyleue group having from 2 to 5 carbon atoms and p is 0,
10, The coating composition of claim 8, wherein lhe amino functional silanc comprises γ- amiαopropyltrimcthoxysilane.
11 , The coating composition of claim 3, wherein lhe Michael addition reaction product is the product of reactants consisting essentially of; (a) a compound comprising more than one site of ethyleiiic unsatυration, and (b) an aminofunctional silane.
12, The coating composition of claim 3, wherein:
(1) at least 50 percent of the total secondary amine groups present in the coating compositions arc present on the ungelled, secondary amine-contaiiihig, Michael addition reaction product; and
(2) at least 10 percent of the total amine groups present in. the coating compositions are present on the cyclic diamine.
13, The coating composition of claim 4, wherein the compound comprising functional groups reactive with secondary amine groups comprises a polyepoxide,
14. The coating composition of claim 13» wherein the polyepoxide is saturated.
15. The coating composition of claim 13, wherein the polyepoxide is an epoxy ether obtained by reacting an epihalohydrin with a polyphenol.
16. The coating composition of claim 1, wherein the composition is substantially free of solvent.
17. The coating composition of claim 1, further comprising a poiysiloxane.
18. A substrate at least partially coated with a coating deposited from the coating composition of claim 1,
19. A method of using the coating composition of claim 1, comprising:
(a) depositing the coating composition onto at least a portion of a substrate;
(b) allowing the coating composition to coalesce to form a substantially continuous film; and
(c) exposing the film to air having a relative humidity of 10 to 100 percent and a temperature of - 10 to 12OºC.
20. A coating composition comprising:
(a) an ungelled, secondary amine-containing, Michael addition reaction product of reactants comprising :
(i) a compound comprising more than one site of ethylcnic unsaturation, and (ii) an aniinofunctional silane;
(b) a cyclic diamine according to the general structure:
(c) a compound comprising functional groups reactive with secondary amine groups,
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| US12/433,167 US8349066B2 (en) | 2006-09-21 | 2009-04-30 | Low temperature, moisture curable coating compositions and related methods |
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| CN104829642A (en) * | 2015-04-13 | 2015-08-12 | 绵阳惠利电子材料有限公司 | Silane compound and preparation method thereof, and translucent dealcoholization type room temperature curing silicon rubber and preparation method thereof |
| EP3178862A1 (en) * | 2015-12-11 | 2017-06-14 | Evonik Degussa GmbH | Latent epoxy resin formulations for liquid impregnation processes for the manufacture of fiber reinforced composites |
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| US20080075871A1 (en) * | 2006-09-21 | 2008-03-27 | Ppg Industries Ohio, Inc. | Low temperature, moisture curable coating compositions and related methods |
| US8772375B2 (en) * | 2011-02-19 | 2014-07-08 | Ling Tan | Composition of polyacrylate, epoxy and polyamine |
| US20130237638A1 (en) * | 2012-03-09 | 2013-09-12 | Ppg Industries Ohio, Inc. | Low temperature, moisture curable coating compositions and related methods |
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| US20090205537A1 (en) | 2009-08-20 |
| US8349066B2 (en) | 2013-01-08 |
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